IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Execution via Windows Subsystem for Linux

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Execution via Windows Subsystem for Linux

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Detects attempts to execute a program on the host from the Windows Subsystem for Linux. Adversaries may enable and use WSL for Linux to avoid detection.

Rule type: eql

Rule indices:

winlogbeat-*
logs-endpoint.events.*
logs-windows.*
endgame-*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://learn.microsoft.com/en-us/windows/wsl/wsl-config

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Defense Evasion
Data Source: Elastic Endgame
Data Source: Elastic Defend

Version: 4

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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process where host.os.type == "windows" and event.type : "start" and
 process.parent.executable :
    ("?:\\Windows\\System32\\wsl.exe",
     "?:\\Program Files*\\WindowsApps\\MicrosoftCorporationII.WindowsSubsystemForLinux_*\\wsl.exe",
     "?:\\Windows\\System32\\wslhost.exe",
     "?:\\Program Files*\\WindowsApps\\MicrosoftCorporationII.WindowsSubsystemForLinux_*\\wslhost.exe") and
  not process.executable :
           ("?:\\Windows\\System32\\conhost.exe",
            "?:\\Windows\\System32\\lxss\\wslhost.exe",
            "?:\\Windows\\Sys*\\wslconfig.exe",
            "?:\\Program Files*\\WindowsApps\\MicrosoftCorporationII.WindowsSubsystemForLinux_*\\wsl*.exe",
            "?:\\Windows\\System32\\WerFault.exe",
            "?:\\Program Files\\*",
            "?:\\Program Files (x86)\\*")

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Indirect Command Execution
- ID: T1202
- Reference URL: https://attack.mitre.org/techniques/T1202/

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